8a1-5复习题

初二上册一五单元试卷一、选择题（每题2分，共20分）1. 下列哪个选项是正确的？A. 地球是太阳系中最大的行星B. 地球是太阳系中唯一有生命的行星C. 地球是太阳系中唯一的固体行星D. 地球是太阳系中唯一的气态行星答案：B2. 以下哪个不是哺乳动物的特征？A. 胎生B. 有肺C. 有羽毛D. 有乳腺答案：C3. 以下哪个选项是正确的？A. 光年是时间单位B. 光年是长度单位C. 光年是速度单位D. 光年是质量单位答案：B4. 以下哪个选项是正确的？A. 牛顿第一定律是惯性定律B. 牛顿第二定律是惯性定律C. 牛顿第三定律是惯性定律D. 牛顿第四定律是惯性定律答案：A5. 以下哪个选项是正确的？A. 氧气是可燃的B. 氧气是助燃的C. 氧气是不可燃的D. 氧气是有毒的答案：B6. 以下哪个选项是正确的？A. 植物的根负责光合作用B. 植物的茎负责光合作用C. 植物的叶负责光合作用D. 植物的花负责光合作用答案：C7. 下列哪个选项是正确的？A. 细胞是所有生物的基本单位B. 细胞是所有植物的基本单位C. 细胞是所有动物的基本单位D. 细胞是所有微生物的基本单位答案：A8. 以下哪个选项是正确的？A. 心脏是呼吸系统的主要器官B. 心脏是循环系统的主要器官C. 心脏是消化系统的主要器官D. 心脏是神经系统的主要器官答案：B9. 以下哪个选项是正确的？A. 电子是最小的原子B. 电子是最小的粒子C. 电子是最小的分子D. 电子是最小的细胞答案：B10. 以下哪个选项是正确的？A. 光速在所有介质中都是相同的B. 光速在真空中是最快的C. 光速在空气中是最快的D. 光速在水中是最快的答案：B二、填空题（每题2分，共20分）1. 地球的自转周期是______。

答案：24小时2. 光合作用的主要场所是______。

答案：叶绿体3. 牛顿的第三定律表明，作用力和反作用力______。

答案：大小相等，方向相反4. 人体最大的器官是______。

Unit 5 Exercise 1一．根据提示及句意完成单词。

1. Mr Wu plans to visit Taiwan, a beautiful island(岛) in s_________ China soon.2. Wolong n___________ reserve in Sichuan is an ideal place for giant pandas.3. Winter is coming. But those survivers still have no ___________(住所)to live.The Chinese ____________(政府) decided to take actions to help them.4. The company（公司）___________(give sth to sb) lots of money for water project.5. A coach fell into the river and many ___________( people who are traveling)died. 二．用所给词的适当形式填空。

1. Some students don’t know the ____________of English, so they don’t work hard.2. Amy is good at computers, and she worked out the problem _____________.3. After a heavy rain, the ground became even___________ than before.4. Australia is a country in the ____________ part of the earth.5. To our surprise, few people know how to protect the ____________ animals.三．用所给动词的正确时态填空。

Unit1形容词比较级与最高级练习一、选择题1. It is ________ today than yesterday . Shall we go swimming this afternoon ?A. the hottestB. hotC. hottestD. hotter2.—Which is ____ season in Nanjing? —I think it's spring.A. goodB. betterC. bestD. the best3. Tom is taller than _______ in his class. He sits in the back row.A. any studentB. any other studentC. every studentD. any boy4. –Which do you think is __________in China, football or basketball.--I think football is.A. most popularB. more popularC. the most popularD. the more popular5.-- Don’t you think Unit 2 is ____________ easier than Unit 1 in his book?A. moreB. muchC. veryD. quite6. ---Do you like traveling by plane?---I like traveling by train. Travelling by plane isn’t as __________ as travelingby train.A. safeB. excitingC. saferD. more exciting7. ---Which bag is ___________ of the two?---I think the blue one is.A. the heaviestB. the heavierC. heaviestD. heavy8. ---Mrs. Yang, you look much _____________ than before?---Really? Thanks. You see, I am on a diet these days.A. fatterB. slimC. slimmerD. slimer9. ---Do you like English or maths?---I like English better. It’s ________________ maths.A. more interesting thanB. not as interesting asC. as difficult asD. more difficult than10. ---Do you like living in a city?---No. A city isn’t so quiet ____________ a town.A. asB. soC. thanD. in二．形容词的正确形式填空1. My mother is the _________ (busy) in my family. She has lots of housework to do.2. Diving is very _____________(exciting). But it’s ____________(dangerous) than swimming.3. A bus is usually _____________(fast) than a ship. But it’s not as ___________(fast) as a car.4. With Mr. Li’s help, I am much ____________(good) at English now.5. Shanghai is one of the _____________(large) cities in the world.6. Jacky’s drawing is _____________(bad) than Tom’s. He needs to spend more time on it.7. ---What a ___________(fine) day! ---So it is. It’s the ____________(fine) day this month.三．句型转换1. My bike is better than his.His bike is not __________ __________ __________ mine.2. He is the most careful boy in his class.He is __________ __________ __________ any other boy in his class.3. I don’t think he is as fast as Tom.I think he is __________ __________ Tom.4. China is larger than any other country in Asia(亚洲).China is __________ __________ country in Asia.5. Mary’s hair is the longest of the three girls.Of the three girls, Mary __________ __________ __________ hair.四. 用所给词的正确形式填空1. Tom has _________(many) erasers than I.2. The red pen is________(nice) than the green pen.3. You are no_______(long) a child.4. He d idn’t sing a song in English any _______ (much).5. Who came here__________(early), Mary or Jane?6. Which subject is __________________(important), science, art or Maths?7. Mr Lin is much _______(rich) than Mr Wang.8. He is ________________(good) teacher in our school.9. He is ________________(fat) of the three.10. The busier he is, ______________ (happy) he is.11. Look at the apple! I think it is __________ (big) one in this group.12--- How _______ (nice) the watch is!---Yes, and it is ________ (expensive) than others. It is ________ (expensive) one in the shop.五. 翻译句子1．Lily的房间很明亮，而我的房间比她的房间更明亮。

8A - Unit 5单元测试卷命题：揭光品审核：揭光品校对：揭光品说明：本试卷共6页，满分120分，考试时间40分钟。

一、单项选择（共15小题；每小题1分；满分15分）( ) 1. ______your family all _______ home?A, Is, in B, Are, at C, Are, in D, Is, at() 2. Our journey to the UK was ______.A. a happy experienceB. an happy experienceC. happy experienceD. experience happy( ) 3. This bay is so expensive, she _______ about 10,000 yuan buying it.A. paidB. costC. tookD. spent( ) 4. --Have you ever finished your work _______?--No, not _______.A. already; yetB. already; alreadyC. yet; alreadyD. yet; yet ( ) 5. The student’s parents want to see him _______ his study.A. successB. succeedC. succeed inD. success in() 6. ─ Do you want ______ cake?─ Yes, I usually eat a lot when I'm hungry.A. otherB. othersC. anotherD. the other( ) 7. He tells me he________ China for over five years.A. has beenB. has been inC. has been toD. has gone to ( ) 8. –Is you mother in New York?-- No, she _________ America.A. has never gone toB. has never gone inC. has never been toD. has never been in( ) 9. The room contained ________ students.A. a large amount ofB. a great deal ofC. a lots ofD. plenty of( ) 10. ________ weekdays, what time do you usually get up?A. AtB. ForC. OnD. In( ) 11. After a 20 minutes’ walk, Angela and Kimi felt _______ tired.A. a bit ofB. a littleC. a lot ofD. a few( ) 12. I enjoy reading English story books and science fiction ____.A. as wellB. neitherC. eitherD. too( ) 13. Did you _______ the meeting yesterday?A. joinB. attendC. join inD. take part in( ) 14. _____________ the doors and windows when you leave the classroom.A. Remember closeB. Remember closingC. Remember to closeD. Remember to closing( ) 15. The students in our school practise ______ every day.A. runB. runingC. to runD. running二、语法选择（共10小题；每小题1.5分；满分15分）Do you want to be a reporter? If you ___16___, you need to have many skills. Of course, you should be able to write well, but you must know ___17___ to speak well and listen well, too. Reporters talk to a lot of important and famous people. They also talk to quiet, shy people, so you need to be ___18___.You ___19___ study just English and Chinese. You should be __20___ many different things, such as science, art and music. ___21___, you should read every day---books, magazines and, of course, newspapers!___22___ a reporter is exciting, but it’s not always fun. Sometimes you may work for ___23___ hours, but still not be able to write a good report. One day, you may talk to ___24___ famous person and eat in a wonderful restaurant. The next day, you may spend hours in a cold, dirty room without anything ___25___ or drink! Will you still want to be a reporter?16. A. will B. do C. are D. did17. A. what B. who C. how D. when18. A. friendly B. friends C. friendship D. friend19. A. ought B. ought to not C. ought not D. ought not to20. A. interested in B. interesting in C. interested at D. interesting at21. A. More important B. More importance C. More importantly D. Most important22. A. Be B. Been C. To being D. Being23. A. much B. many C. little D. a lot24. A. and B. a C. the D. /25. A. ate B. eating C.eat D. to eat三、完型填空. （共10小题；每小题1.5分；满分15分）Once a king had a great highway built for the members of his kingdom. After it was completed but before it was ___26___to the public, the king decided to have a (n)___27___. He invited as many people as he could to take part in it so that he could see who could travel the ___28___the best.On the day of the competition, the people came. Some of them had fine clothing or great food. They travelled the highway all day, but each one, when arriving at the end, looked rather ___29___and complained to the king that there was a large pile of ___30__on the road at one spot （地点）and that this got in their way.At the end of the day, a traveller crossed the finish line and walked over to the king. He was ___31___and dirty, but he showed great respect to the king and handed him a bag of gold.He explained that he stopped along the way to clear(清理) a pile of rocks and found that bag of gold under it all. He hoped that the king could help him to __32___it to its owner.The king replied, “You are the rightful owner. This is the ___33___ for the winner. You travels the road ___34___because you clear the road for those who will __35___.”26. A. open B. used C. closed D. sent27. A. game B. match C. competition D. race28. A. kingdom B. highway C. way D. line29. A. happy B. excited C. angry D. sad30. A. rocks B. gold C. clothing D. bags31. A. surprised B. tired C. lonely D. worried32. A. hand B. take C. return D. collect33. A. pay B. money C. prize D. coin34. A. best B. fastest C. most slowly D. truly35. A. go B. move C. run D. follow四、阅读理解（共15小题；每小题2分；满分30分）AIn Germany there are different kinds of high schools. Some prepare students for workers, others prepare them for college. All schools are great places for making friends and learning German. Short daysMost high schools in Germany begin at about 8:00 a.m. and end at about 3:30 p.m. This means your morning will be busy with classes. You will have time to do homework and take part in private(私人的) clubs after school.Formal settingIn Germany, teachers and students’ relationship is more formal than you might be used to. Teachers are respected and students must use the formal “Sie（德语，您）” when talki ng to teachers.Getting to schoolMost students take public transport to school or ride a bicycle. Some areas have school buses. It is not common for parents to drive students to school.Private clubsIn many countries, schools offer official sports and after-school activities. This is less common in Germany. After-school activities are usually organized through private clubs. There are clubs for things like soccer, dance, choir, theatre and almost everything else. Once you are in Germany, ask around at school and talk to other students to find out what private clubs are in your area and meet your interests.Different states, different schoolsEach of Germany’s 16 states has its own slightly different school systems. The school system in Brandenburg will be a little different from the system in Bavaria for example. Where you live, your knowledge level and your age will decide what school you can attend.( ) 36. For high school students in Germany, which is NOT the common transport to school?A. School buses.B. Parents’ cars.C. Public transport.D. Students’ bicycles.( ) 37.In Paragraph 3,the underlined word “respected” can be best translated into __________.A.受人尊敬的B.令人害怕的C.高收入的D.有权势的( ) 38. From the passage, we can learn that in Germany _______.A. all kinds of high schools are for collegeB. age is not important for attending schoolsC. students can take part in after-school activities from 8:00 a. m .to 3:30 p.m.D. students can join private clubs to meet their interests by themselves( ) 39. How can you find out what private clubs are if you are in Germany?A. Drive a carB. Ride a bicycleC. Ask your host familyD. Ask around at school and talk to other students( ) 40. What can be the best title for this article?A. German Private ClubsB. German Public TransportC. German High SchoolsD. German College SystemsA. school nameB. e-mail addressC. year of birthD. telephone number( ) 42. What is required for the articles wanted according to the passage?A. They must be fully created by the writers themselves.B. They must be typed in single space and on both sides.C. They must be provided with photos and descriptions.D. They must be sent with the copies of texts and pictures.( ) 43. According to the passage, you can send your articles_____.A. within 3 weeksB. all summerC. all the year roundD. during the whole term( ) 44. How many ways can you find in the passage to contact School Life?A. 1.B.2.C.3.D. 4.( ) 45. Who do you think will write articles for School Life?A. Students who are interested in writing.B. Teachers who love writing and taking photos.C. Parents who wish their kids to be popular writers.D. Readers who had a happy time in their childhood.CThe first Starbucks coffee shop opened in 1971 in downtown Seattle，Washington，in the United States．It was a small coffee shop that roasted its own coffee beans．The coffee shop’s business did well，and by 1981 there were three more Starbucks stores in Seattle．Things really began to change for the company in 1981．That year，Howard Schultz met the three men who ran(经营) Starbucks．Schultz worked in New York for a company that made kitchen equipment．He noticed that Starbucks ordered a large number of special coffee makers．and he was curious about the company．Schultz went to Seattle to see what Starbucks did，and he liked what he saw．He wanted to become part of the company．In 1982，the original(原先的)Starbucks owners hired Schultz as the company’s head of marketing．In 1983，Schultz travelled to Italy．The unique atmosphere of the coffee bars there caught his eye．To Schultz, it seemed that Italians spent their daily lives in three places：home，work，and coffee bars．His experience in Italy gave Schultz a new idea for Starbucks back in Seattle．Schultz created an atmosphere for Starbucks coffee shops that was comfortable，and customers everywhere seemed to like it．Between 1987 and 1992，Starbucks opened 150 new stores—and that was only the beginning．In fact，by the year 2000，three new Starbucks stores opened somewhere around the world every day!Today，Starbucks has thousands of stores, including stores in twenty-six countries．One thing that helps make Starbucks succeed in cities outside the United States is the way Starbucks works with local stores and restaurants．By working together with a store already in the city，Starbucks gets an understanding of customers in the city．This understanding helps Starbucks open stores in the right locations for their customers．46．What is the main idea of this passage?A．How Starbucks has grown B．What Starbucks makes．C．Starbucks’ customers．D．How Starbucks makes its coffee．47．Which is true about Starbucks’ first ten years of business?A．It grew very quickly．B．It was run by Howard Schultz．C．It made special coffee makers．D．It was a small company．48．Who is Howard Schultz?A．A coffee seller in New York．B．An Italian coffee makerC．The man who changed the company．D．One of the original owners of the company．49．How many new Starbucks stores probably opened in the year 2000 around the world?A. Three.B. About 1095.C. Two thousand.D. Thirty-six.50．What helps Starbucks succeed in places outside the United States?A．Opening restaurants in just a few locations each year．B．Only selling locally produced coffee beans．C．working with other major coffee-making companies．D．Learning about local customers．第二卷五、单词拼写（共10小题；每小题1分；满分10分）51. Studying abroad is a good way to learn about other countries’ customs and c___________.52.We e___________ phone numbers after the party.53.Mary’s father works in a l___________ hospital in her hometown.54.Have you heard his new opera? It is f___________.55.The students in our grade are a___________ about 13.56. As g___________, we should be polite to the host.57. Mr. Lee has been a teacher for 10 years, so he has lots of e___________ in teaching.58. I love my class because everyone in it r___________ one another.59. Megan has got used to using c___________ in China.60. We always have classes on w___________.六、词形变化（共5小题；每小题1分；满分5分）用括号中所给单词适当形式填空。

2019年秋八年级上册Unit 1－Unit 5基础知识点巩固练习基础知识反馈练一、用括号内所给单词的适当形式填空。

1. Some girls danced well and some girls sang ___________(beautiful) at the party.2. Father takes his work ___________(serious).3. My friend ___________(give)a model plane to me yesterday. I really like it.4. I bought a second-hand car ___________(cheap)last month.5. In the end, Li Hua ___________(choose)three books he liked.6. Everyone likes watching this film, because it is the ___________(funny) of the three.7. The boy is ___________(create) and he always makes something new in his free time.8.Yuan Longping is one of the ______(great) people that have ever lived, I think.9. Thomas runs ___________(fast) than Tony, but Frank runs ___________ (fast)of them.10. Bob is only three and he is ______________(young) visitor on the bus.11. His father ___________(become) the head teacher of the school three years ago.12. Of the three boys, Peter is the _____________(successful) singer now. We often see him on TV.13. She is great and he is good at making children’s ___________(film).14. －My mother ___________(lose) her umbrella yesterday.－Really? I’m sorry to hear that.15. The dish is ___________(simply)and quick to make. I can teach you.16. My brother doesn’t like scary movies. He thinks they’re ____________(meaning).17. Li Fang is one of the most beautiful ________ (teach) in our country.18. After a few hours, we ___________(arrive)at the beach.二、根据汉语意思或首字母提示填空。

八年级期中复习Unit 1-Unit 5分类巩固练习题一．介词（in, on ,for, with, about, or, from）1.I went to see a movie ______ last Saturday.2.Would you like some Sichuan food _____ dinner ?3.Can you help me ______ my homework ?4.The answers ______ our questions ______ watching television were also interesting.5.Thanks ______ telling me .二．连词2.He went to the mountains last weekend ,_____ he was really tired.3._________ she is eighty , she is still very active.4.----This program is really boring.---It is helpful for learning,________.5.___________ the car is old, it still runs well.6.We can’t play basketball outside today ___________ the rain.7.My brother likes fruit a lot and he eats it three_____ four times every week.三．固定短语1.I love Beijing so I spent quite _____ few years of my life there.2.I know you don’t have much time to read books,but you should read at _________one book a month.(little/less/least)3.My school bag is similar_____ yours.5.Schools play the most important _____ in education.6.That’s ______ to you to decide.7.We have _____ a lot of work to do.8.We can talk about this as______ as you want .9.That’s ________ he was late this morning.10.She was always ready _______ listen to my problems.11._______ do you think of talk shows?12._______ do you like talk shows?四．To do 还是doing1.It is hot, so they decided _____ swimming.2.He made his little brother __________ last night.(cry)3.Let’s _________ games ,now.(play)4.I don’t mind ___________ the fan.(turn)5.He keeps _________,though it is raining.(run)6.We enjoy__________ books together.(read)7.You are so nice, thanks for __________me the news.(tell)8.The boss made Tom _________ long hours.(work)9.Would you mind ___________ the widow.(open)10.I expected ______ Linda there.(meet)(总结：____________+ to do /_______________+ doing /____________+ do)五．Be还do(does, did)1.How ______ your last summer vacation?2.He plays basketball as well as Lily _____.3.He is happy ,_____he ?4.He gets up early ,______ he ?5.He is more outgoing than you _____.6.It’s easy for me _________ friends.(make)六．单词在句子的位置1.Lily, do you have ____________ to tell me ?(anything new/new anything )2.He is ___________ to carry the big box.(enough strong/ strong enough)3.we _______like apples.(both like/like both)3.That’s why __________ late for school.(were they /they were)七．疑问词1.----_____________did you go on vacation ?---- We went to Shanghai.2.--_____________ did you go to the mountains?---We went to the mountains last week.3.---_____________ does Cindy go to the movies ?--She goes to the movies once a month.4.__________is more beautiful, the yellow one or the black one ?5.That’s ______ I like playing sports.八．易错1.To keep healthy, you should eat_________ junk food, _______fresh vegetables and often exercise.2.Twenty_______ of the students spend 3 hours on homework every day.(percent/hundreds/hundred)3.___________ of students spend 2 hours reading books every day.(percent/hundreds/hundred)4. This restaurant has ____________service of the two.(friendly)5.I know _________________ about the singer.(some information/some informations )6．He is _________________of the two.(friendly)7.He buys the book __________ than I do .So His book is _______ than mine.(cheap)8.Could you ________ take out the trash ?9. The bridge between the two islands is __________ one in Shanghai.(long)10.—Who does homework __________, Tom,Jack or Bill ?---Bill.(careful)11.Kate danced __________ among the singers(好)12.Shanghai is one of the ___________ _________ in our country.(big,city)。

分式测试题第1页（共5页）八年级上数学第一章分式测试题（时限：100分钟 总分：100分）班级 姓名 总分一、 选择题(本题共8小题，每小题4分，共32分)1. 计算23-的结果是（ ）A.9-B.6-C. 91- D. 91 2. 2019年3月11日，里氏9.0级的日本大地震导致当天地球的自转时间较少了0.000 001 6秒，将0.000 001 6用科学记数法表示为（ ）A. 71016-⨯B. 6106.1-⨯C. 5106.1-⨯D. 51610-⨯ 3. 已知53=-a b a ，那么b a 等于 （ ） A. 52 B. 25 C.52- D. 25- 4. 下列各式从左到右的变形，正确的是（ ） A.y x xy y x xy +-=+- B. yx xy y x xy --=--- C. 11---=-+-py y p py y p D. 111122+--=++-a xy a xy 5. 如果把分式y x y x +-中的x 和y 都扩大了3倍，那么分式的值（ ） A. 扩大3倍 B. 不变 C. 缩小3倍 D. 缩小6倍6. 化简2293m m m --的结果是（ ） A. 3+-m m B. 3+m m C.3-m m D.mm -3分式测试题第2页（共5页）7. 43222)()()(xy x y y x -÷-⋅-的结果是（ ） A.38x y B.38xy - C.5x D.5x - 8. 已知0≠-b a ，且032=-b a ，则ba b a -+2的值是（ ） A. 12- B. 0 C. 8 D. 128或二、填空题(本题共8小题，每小题4分，共32分)9. 当x ________时，分式x x 2121-+的值存在． 10. 当分式2545|x |x x ---的值为0时, x 的值为__ _. 11. 用科学记数法表示0.00021=_______；用小数表示=⨯-61057.3___ __.12. 利用分式的基本性质填空：（1）())0(,10 53≠=a axy xy a （2）() 1422=-+a a 13. 计算：=+-+3932a a a __________． 14. 计算：abb a b ab -÷-)(2＝ . 15. 方程04142=----xx x 的解是 . 16．已知311=-y x ，则分式yxy x y xy x ---+2232的值为 ___ ． 三、解答题(本题共6小题，共36分)17. （本小题满分10分）化简：分式测试题第3页（共5页）（1）43239227b ab a b ab ⋅÷-； （2）21211x x x -++； （3）3121421)()()(----⋅-⋅x y xy xy ；（4）122121222+--÷---+a a a a a a a a ； （5）⎪⎭⎫ ⎝⎛--++-y x x y x y x x 2121.18. （本小题满分6分） 解分式方程：（1）87176=-+--xx x ； （2）2127111x x x +=+--.19. （本小题满分4分）先化简，再求值. 4212112--÷⎪⎭⎫ ⎝⎛-+x x x ，其中3=x ． 20. （本小题满分5分）已知实数a 满足a 2＋2a －8=0，求34121311222+++-⨯-+-+a a a a a a a 的值.21. （本小题满分5分）列方程解应用题雅安地震灾情牵动全国人民的心．某厂计划加工1500顶帐篷支援灾区，加工了300顶帐篷后，由于救灾需要，将工作效率提高到原计划的2倍，结果提前4天完成了任务．求原计划每天加工多少顶帐篷.分式测试题第4页（共5页） 22. （本小题满分6分）列方程解应用题小红到离家2100米的学校参加艺术节联欢会，到学校时发现演出道具忘在家中，此时距联欢会开始还有45分钟，于是她马上步行回家取道具，随后骑自行车返回学校．已知小红骑自行车到学校比她从学校步行到家用时少20分钟，且骑自行车的平均速度是步行平均速度的3倍．(1)小红步行的平均速度(单位：米/分)是多少？(2)小红能否在联欢会开始前赶到学校？（通过计算说明你的理由）八年级数学第一章分式测试题参考答案一、 选择题：1.D ； 2. B ； 3.B ； 4.C ； 5.B ；6. A ；7.D ；8.C二、填空题：9. 12x ≠； 10.5-； 11. 2.1×10-4，0.00000357； 12. （1）26a ， （2）2-a ；13. 3-a ； 14. 2ab ； 15. 3x =； 16. 53.三、解答题： 17. （1）221ab -；（2）x -11；（3）21x ；（4）a a a a ++-221；（5）1.18. （1）原方程无解；（2）2x =.19. （1）原式2212421x x x x -+-=⋅-- )1)(1()2(221+--⋅--=x x x x x 12+=x . 当3=x 时，原式=2112=+x .分式测试题第5页（共5页）20.2)1(2+a ；当a 2＋2a －8=0时，有9)1(2=+a ，所以原式＝92. 21. 解：设原计划每天加工x 顶帐篷. 则1500300150030042x x---=. 解得 150x =.经检验，150x =是原方程的解，且符合题意.答：原计划每天加工150顶帐篷.22. 解：(1)设小红步行的平均速度为x 米/分，则骑自行车的平均速度为3x 米/分. 根据题意得：21002100203x x=+．得70x =．经检验70x =是原方程的解 ． 答：小红步行的平均速度是70米/分．(2)根据题意得:21002100404570370+=<⨯ ． ∴小红能在联欢会开始前赶到．。

一、选择题1．关于光现象，下列关联错误的是（）A．影子的形成——光的直线传播B．缥缈不定的海市蜃楼——光的反射C．“老花眼”戴“老花镜”——凸透镜对光有会聚作用D．朗朗夜空中的星光闪烁——光的折射B解析：BA．光在同种均匀介质中沿直线传播，沿直线传播的光照到不透明的物体上，被物体挡住，在物体后面光线照不到的地方形成影子，A选项正确，不符合题意；B．海市蜃楼是一种由光的折射产生的现象，是由于空气的密度不均匀而引起的，B选项错误，符合题意；C．老花镜的镜片是凸透镜，它对光有会聚作用，C选项正确，不符合题意；D．当繁星发出或反射的光线穿过大气层时，由于大气层的运动，疏密不断变化，大气层对星光折射的折射光线的方向也在不断变化，所以星光时明时暗的闪烁，D选项正确，不符合题意。

故选B。

2．下列图示中光现象的描述正确的是（）A．图甲中，人佩戴的凹透镜可以矫正远视眼B．图乙中，漫反射的光线杂乱无章不遵循光的反射定律C．图丙中，平面镜成像时进入眼睛的光线是由像发出的D．图丁中，光的色散现象说明白光是由各种色光混合而成的D解析：DA．远视眼的晶状体比较薄，成像在视网膜的后面，需要用凸透镜进行矫正；近视眼是因为晶状体厚，成像在视网膜的前面面，需要用凹透镜进行矫正。

故A错误；B．图乙中，平行光反射后的光线杂乱无章，这是发生了漫反射，同样遵循光的反射定律，故B错误；C．平面镜成的像是虚像，是由反射光线的反向延长线会聚形成，虚像并不能发出光线；进入眼睛的光线是由物体发出的光线经平面镜反射后进入的。

故C错误；D．光的色散现象是指白光经过三棱镜折射后分解成七色光形成一条彩色光带，可以说明白光是由各种色光混合而成的，故D正确。

故选D。

3．下列四组连线，不完全正确的是（）A．冬天玻璃上出现窗花——凝华夏天湿衣服晒干——汽化B．闻其声知其人——音色不同风吹树叶哗哗响——振动发声C．近视镜——凹透镜照相机镜头——凸透镜D．利用海水制淡水——液体蒸发卫生丸（樟脑丸）不见了——汽化D解析：DA．冬天玻璃上出现窗花，这是由于水蒸气凝华形成的小冰晶，这是凝华；夏天湿衣服晒干，湿衣服有水分在里面，从液态水变成气态水蒸气，这是汽化；这项完全正确，故A不符合题意；B．闻其声知其人，这是因为不同人音色是不同的，通过这辨别不同的人；风吹树叶哗哗响，这是因为树叶在振动，发出声音，这是振动发声；这项完全正确，故B不符合题意；C．近视镜是中间薄，边缘厚，它是凹透镜；照相机镜头相当于一个凸透镜；这项完全正确，故C不符合题意；D．利用海水制淡水，海水有盐和水，制淡水时只要是利用液体水蒸发成水蒸气，这是液体蒸发；卫生丸（樟脑丸）不见了，这是固体直接升华成气体，这是升华，不是汽化；这项不完全正确，故D符合题意。

牛津八年级（A）Unit 1-5 测试题Ⅰ.词汇（每小题1分）A)根据句意及首字母提示，补全单词。

1. Daniel wants to c his school life with Nancy’s and John’s.2. Who are wto help the old man?3. Simon is a naughty boy. He likes to play j ____ on everyone.4. If you can’t s___ the problem, you can e and ask us for help.5. Lu Xun is one of the most famous w__________ in China.6. How many sdo you have to learn?7. The little girl can't find her mother. So she is crying s___________.8. There are many places of i _____ in Suzhou.9. —What are you doing now?—I’m p______ for the ing trip.10. The visitors are always amazed by the b of the scenery.11. The nature park provides food and s______ for wild animals.12. Zhalong is one of the world’s most important w________.13. The Chinese government want to protect these _e_______ bird species.14. If you do not protect the forests, it will be u________to see these birds.15. The young man lives an i______ life . Sometimes he gets up after lunchtime.16. Some birds go to this nature reserve for a short s______.17. Simon is d______. You’d better not believe what he says.18. You can buy different kinds of things from a big m______.19. The tigers here are p______. Nobody can hurt them.20. If you put l______ into the dustbin, you are wele.B)根据句意，用括号里所给单词的适当形式填空。